TWI763927B - Hydraulic control device - Google Patents

Abstract

A hydraulic control device 10 includes a hydraulic reservoir 12 having an air passage 18. The air passage 18 includes a first portion 18a and a second portion 18b. The first portion 18a extends along a first direction D1, and the second portion 18b extends along a second direction D2 that is different from the first direction D1. The hydraulic reservoir 12 further includes a reservoir tank 22 having a tank opening 24, a lid 25 attached to the tank opening 24, and a diaphragm 28 disposed in the reservoir tank 22. The hydraulic reservoir 12 defines a fluid chamber 30 between the reservoir tank 22 and the diaphragm 28, and an air chamber 32 between the diaphragm 28 and the lid 25. The air passage 18 is configured to connect the air chamber 32 to an atmosphere via a passage opening 34.

Description

Hydraulic Controls

In recent years, some small vehicles, especially bicycles, have been provided with hydraulic control devices mounted on the handlebars for controlling, for example, hydraulic braking systems. The hydraulic brake system control device may include air passages exposed to the atmosphere on one end face of the control device that allow for changes in the volume of the hydraulic brake system working fluid, such as due to thermal expansion or contraction of the working fluid, and/or due to frictional member wear. Causes the hydraulic path of the hydraulic brake system to expand.

According to a first aspect of the present invention, a hydraulic control device for a small vehicle, including a bicycle, includes a hydraulic tank having an air passage. The air channel includes a first portion and a second portion, the first portion extends along a first direction, and the second portion extends along a second direction different from the first direction.

Using the hydraulic control device according to the first aspect, since the first direction is different from the second direction, there is flexibility to direct the air passage to different locations on the control device. Thus, the air channel can be directed to a position where effective airflow is maintained.

According to a second aspect of the present invention, the hydraulic control device according to the first aspect is constructed in such a way that the hydraulic sump includes an oil sump having a sump opening, an oil sump attached to the sump opening A cover for the port, and a baffle in the oil sump. The hydraulic sump defines a fluid chamber between the oil sump and the diaphragm, and an air chamber between the diaphragm and the cover.

With the hydraulic control device according to the second aspect, the baffle can allow the fluid chamber volume to change, and the cover can provide access to the oil sump to replace the baffle.

According to a third aspect of the present invention, the hydraulic control device according to the second aspect is constructed in a manner that the air passage is used to connect the air chamber to the outside.

With the hydraulic control device according to the third aspect, there can be air exchange between the air chamber of the hydraulic tank and the outside world. This is advantageous because pressure build-up is suppressed when volume changes occur in the air chamber and the fluid chamber during use.

According to a fourth aspect of the present invention, the hydraulic control device according to the third aspect is constructed in a manner in which the air passage further includes a passage opening facing the outside.

With the hydraulic control device according to the fourth aspect, the air in the fluid in the hydraulic tank can be communicated with the outside through the passage opening, so as to suppress the accumulation of pressure when a volume change occurs in the air chamber during use.

According to a fifth aspect of the present invention, the hydraulic control device according to the fourth aspect is constructed in a manner that the air passage includes a plurality of passage openings.

With the hydraulic control device according to the fifth aspect, air exchange is performed between the air passage and the outside world through two or more passage openings. This configuration reduces the pressure of the airflow through each channel opening, increases the speed of air exchange between the outside world and the air chamber in the hydraulic tank, and ensures that the air exchange is maintained.

According to a sixth aspect of the present invention, the hydraulic control device according to the fourth or fifth aspect is constructed in a manner that the passage opening is defined between the oil groove and the cover.

With the hydraulic control device according to the sixth aspect, air is exchanged between the air passage and the environment at a location between the oil sump and the cover. This aspect may simplify manufacturing, for example, by not requiring through-holes in the lid. Furthermore, this aspect can make the channel opening inconspicuous.

According to a seventh aspect of the present invention, the hydraulic control device according to the fourth or fifth aspect is constructed in a manner that the hydraulic tank further includes a fastener for fastening the cover to the an oil sump, and the passage opening is provided in the fastener.

With the hydraulic control device according to the seventh aspect, air is exchanged between the air passage and the outside through the fastener, which allows for a small and unobtrusive configuration.

According to an eighth aspect of the present invention, the hydraulic control device according to any one of the second to seventh aspects is constructed in a manner in which the oil groove is elongated so that the width of the oil groove opening is smaller than the width of the oil groove opening. Maximum depth of oil sump.

With the hydraulic control device according to the eighth aspect, the size of the oil sump opening can be minimized so that it can be mounted on the handlebar in an unobtrusive elongated shape.

According to a ninth aspect of the present invention, the hydraulic control device according to any one of the second to eighth aspects is constructed in a manner that the oil tank has a circular or polygonal cross-section.

Using the hydraulic control device according to the ninth aspect, the oil sump can be manufactured using simple processes such as drilling or milling techniques, for example.

According to a tenth aspect of the present invention, the hydraulic control device according to any one of the second to ninth aspects is constructed in a manner in which the air passage is provided at least partially within the cover.

With the hydraulic control device according to the tenth aspect, the cover can be fabricated to include an air passage in the cover, so that the air in the air chamber can enter a passage opening through the air passage in the cover.

According to an eleventh aspect of the present invention, the hydraulic control device according to any one of the first to tenth aspects is constructed in a manner that the first direction is perpendicular to the second direction.

With the hydraulic control device according to the eleventh aspect, air can advance in the first part into the cover in the first direction and through a passage opening perpendicular to the first part, in the second part Leaving the hydraulic sump along the second direction leaves the channel opening positioned on the outside.

According to a twelfth aspect of the present invention, the hydraulic control device according to any one of the first to eleventh aspects is constructed in a manner in which the air passage further includes a third portion extending along the A third direction different from the second direction extends.

With the hydraulic control device according to the twelfth aspect, a third part is provided in addition to the first part and the second part, thereby increasing flexibility so that the air passage can be directed to further maintain effective airflow.

According to a thirteenth aspect of the present invention, the hydraulic control device according to the twelfth aspect is constructed in such a manner that the second part is disposed between the first part and the third part.

With the hydraulic control device according to the thirteenth aspect, the air in the air passage can be guided in the first direction in the first part, continue in the second direction in the second part, and pass through a Channel openings leave the hydraulic grooves in the third portion along the third direction, improving guiding flexibility.

According to the fourteenth aspect of the present invention, the hydraulic control device according to the twelfth or thirteenth aspect is constructed in a manner that the first direction is perpendicular to the third direction.

Using the hydraulic control device according to the fourteenth aspect, the air in the air passage can be guided in the first direction in the first part and continue in the second direction in the second part and through a passage opening, which is perpendicular to the first portion in a configuration such as in the fastener providing the passage opening, and exits the hydraulic sump along the third direction in the third portion.

According to a fifteenth aspect of the present invention, the hydraulic control device according to the twelfth or thirteenth aspect is constructed in a manner that the first direction is parallel to the third direction.

With the hydraulic control device according to the fifteenth aspect, the air in the air passage can be guided in the first direction in the first portion, continuing in the second direction in the second portion, and through A passage opening, parallel to the first portion in a configuration such as in the cover providing the passage opening, exits the hydraulic sump along the third direction in the third portion.

According to a sixteenth aspect of the present invention, the hydraulic control device according to any one of the twelfth to fifteenth aspects is constructed in a manner that the second direction is perpendicular to the third direction.

With the hydraulic control device according to the sixteenth aspect, the air in the air passage may be directed in the first direction in the first portion, continue in the second direction in the second portion, and through An access opening, which is perpendicular to the second portion, eg, in a configuration where the access opening is provided in the lid, exits the lid along the third direction in the third portion.

According to a seventeenth aspect of the present invention, the hydraulic control device according to any one of the first to sixteenth aspects is constructed in a manner that the air passage includes a plurality of second parts, and the air The channel further includes a fourth portion communicating with each of the plurality of second portions.

Using the hydraulic control device according to the seventeenth aspect, in a configuration in which, for example, the second portions are arranged radially from the center of the cover and the fourth portion is arranged around the periphery of the cover, the air in the air passages Can be guided along a plurality of second portions to connect to a fourth portion. This aspect allows air to be displaced from the air chamber to the fourth portion through one or more second portions, thereby ensuring airflow between the air channel and the outside world.

According to an eighteenth aspect of the present invention, the hydraulic control device according to any one of the twelfth to sixteenth aspects is constructed in a manner that the air passage includes a plurality of third parts, and the The air passage further includes a fourth portion communicating with each of the plurality of third portions.

With the hydraulic control device according to the eighteenth aspect, in a configuration in which passage openings are provided, for example, in the cover, air may advance from a fourth portion through a plurality of first passages each having a respective passage opening. three parts. This aspect allows for more efficient airflow.

The present "Summary" is a selection of concepts introduced in a simplified form that will be further explained in the following embodiments. This Summary is not intended to describe key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. The term "small and/or light vehicle" as used in this specification refers to electric and non-electric vehicles, regardless of the number of wheels, but does not include four-wheeled vehicles that have an internal combustion engine as the source of power to drive the wheels, or that require a permit to Four-wheeled electric vehicle on the road.

1: Bicycle

2: Handlebars

3: Wheels

4: Brake device

5: Disc

10: Hydraulic control device

12: Hydraulic tank

14: Bracket member

16: Tie rod

18: Air channel

18a: Part 1

18b: Part II

18c: Part Three

18d: Part IV

22: Oil tank

22a: inner surface

22b: outer surface

24: Slot opening

25: Lid

26: Fasteners

28: Separator

30: Fluid Chamber

32: Air Chamber

34: Channel opening

210: Hydraulic Controls

225: Lid

234: channel opening

310: Hydraulic Controls

318b: Part II

318d: Part IV

322: Oil tank

325: Lid

334: channel opening

410: Hydraulic Controls

425: Cover

434: Channel Opening

510: Hydraulic Controls

512: Hydraulic tank

525: Lid

526: Fasteners

534: Channel opening

D: maximum depth

D1: first direction

D2: Second direction

D3: third direction

W: width

A more complete evaluation of the present invention and its many hereinafter advantages will become apparent upon reference to the following detailed description and consideration of the accompanying drawings.

Figure 1 is a partial side view of a bicycle having a hydraulic control device according to a first embodiment.

The second figure is a perspective view of the hydraulic control device.

The third figure is a bottom perspective view of the cover of the hydraulic control device.

The fourth figure is a cross-sectional view of the cover of the hydraulic control device taken along the line IV-IV of the third figure.

Figure 5 is a front view of the cover of the hydraulic control device.

Figure 6 is a cross-sectional view of the cover of the hydraulic control device taken along the line VI-VI in Figure 5.

Figure 7 is a perspective view of the cover being removed from the baffle of the hydraulic control device.

Figure 8 is a perspective view of the cover inserted into the bulkhead of the hydraulic control device, showing the arrangement of the bulkhead in the hydraulic tank.

FIG. 9 is a schematic diagram of a hydraulic control device according to a second embodiment.

FIG. 10 is a schematic diagram of a hydraulic control device according to a third embodiment.

FIG. 11 is a schematic diagram of a hydraulic control device according to a fourth embodiment.

FIG. 12 is a schematic diagram of a hydraulic control device according to a fifth embodiment.

Selected embodiments will now be described with reference to the drawings, wherein like reference numerals designate corresponding or identical elements throughout the various figures. Those skilled in the art can understand from the following descriptions of these specific embodiments, the following descriptions of the specific embodiments of the present invention are for illustration only, and do not limit the present invention, the present invention is defined by the accompanying scope of application for patent and its ancillary items. define.

First specific embodiment

Referring now to the first figure, there is illustrated a bicycle 1 having a pair of hydraulic control devices 10 according to this first embodiment. The first figure does not show the hydraulic control device 10 arranged on the left side of the pair of hydraulic control devices 10 . The bicycle 1 is, for example, an off-road bicycle, such as a road bike or a mountain bike. Furthermore, the bicycle 1 may be a road bicycle. A bicycle 1 , which is a small vehicle, comprises a handlebar 2 , one or more wheels 3 , one or more braking devices 4 and one or more discs 5 .

The handlebar 2 is a straight-line handlebar. In addition, the handlebar 2 may be a horn handlebar type, a high handlebar type, a drop handlebar type or other types of handlebars. A pair of hydraulic controls 10 are attached to the handlebars 2 to receive user input from a rider riding the bicycle 1 . The braking device 4 applies a braking force to the disc 5 attached to the wheel 3 in response to this user input on the hydraulic control device 10 . The wheel 3 shown in the first figure is the front wheel.

The second figure is a perspective view of the hydraulic control device 10 . Although the following description details a single hydraulic control device 10, it should be understood that the hydraulic control device 10 is one of a pair. The other of the pair is generally a mirror image of the hydraulic control device 10, eg, the hydraulic control device 10 described below is the right control device used by the rider's right hand, and the other hydraulic control device is the left control device. When a pair is used, one hydraulic control device 10 implements one or more rear controls, while the other hydraulic control device 10 implements, for example, one or more front controls. It will be appreciated that the control device 10 is illustrated in the figures in a relaxed neutral position.

The hydraulic control device 10 includes a hydraulic tank 12 . While the hydraulic control device 10 is illustrated with the hydraulic sump 12 disposed between a bracket member 14 and a tie rod 16 , it should be understood that the hydraulic sump 12 may be otherwise positioned on the hydraulic control device 10 . For example, the hydraulic tank 12 may be arranged in line with the tie rods 16 .

The hydraulic tank 12 has an air passage 18 . As shown in the third figure, the air passage 18 includes a first portion 18a and a second portion 18b. The first portion 18a extends along a first direction D1, and the second portion 18b extends along a second direction D2 different from the first direction D1. As shown in the sixth figure, the first direction D1 and the second direction D2 are perpendicular to each other. Alternatively, the first direction D1 and the second direction D2 may not be perpendicular.

As shown in FIGS. 6 to 8, the hydraulic tank 12 includes an oil tank 22, a partial cross-sectional view of which is indicated by the dotted line in the eighth diagram. The oil sump 22 has a sump opening 24 and a cover 25 attached to the sump opening 24 . As shown in the sixth figure, the air channel 18 is located at least partially within the cover 25 . Figure 5 shows a front view of one embodiment of the cover 25, and Figure 6 provides a partial cross-sectional view of the cover 25 in Figure 5 to illustrate how the cover 25 fits into the sump 22, shown in phantom. Any specific embodiment described in this specification includes a fastener 26 for passing through the oil groove 22 to secure the cover 25 therein, as shown in FIGS. 9-12.

The oil groove 22 further includes an inner surface 22a and an outer surface 22b. A baffle 28 is located within the oil sump 22 . The spacer 28 is disposed beside the groove opening 24 , and the cover 25 is used to be inserted into the groove opening 24 while contacting the inner surface 22 a of the oil groove 22 and the spacer 28 . As shown in Figures 7 and 8, in the illustrated embodiment, the hydraulic sump 12 defines a fluid chamber 30 between the oil sump 22 and the diaphragm 28 . In addition, please refer to FIG. 6 , the hydraulic tank 12 defines an air chamber 32 between the diaphragm 28 and the cover 25 . The air passage 18 communicates the air chamber 32 of the hydraulic tank 12 to the outside world. The separator 28 has a bag shape and is made of an elastic material such as rubber. By allowing air to move freely between the air chamber 32 and the outside world through the air passage 18 , the air chamber 32 defined by the baffle 28 can accommodate changes in the volume of the fluid chamber 30 within the hydraulic tank 12 . As shown by the dotted line in FIG. 6 , the partition plate 28 is arranged beside the cover 25 . In this configuration, the baffle 28 separates the fluid chamber 30 from the air chamber 32 within the oil sump 22, a portion of which is shown in phantom in the sixth figure.

Please refer to FIG. 6 again, the air passage 18 is used for the air chamber 32 to be in contact with the outside world. As discussed briefly above, the partition 28 separating the air chamber 32 from the fluid chamber 30 deforms as the user or rider manipulates the hydraulic control 10 , thereby changing the volume of the air chamber 32 . This movement may increase or decrease the air pressure within the air chamber 32 . Connecting the air chamber 32 to the outside world can use equal air pressure changes caused by the movement of the baffle 28 . In addition, the air channel 18 includes a channel opening 34 facing the outside. This feature facilitates direct contact with the outside world, thereby simplifying the path of airflow between the air chamber 32 and the outside world. The hydraulic control device 10 defines a passage opening 34 between the oil sump 22 and the cover 25, as shown in the sixth figure.

The air channel 18 additionally includes a plurality of channel openings 34 . In other words, the channel opening 34 of the air channel 18 is one of the plurality of channel openings 34 . Although the sixth figure illustrates two channel openings 34 opposite each other, it should be understood that the plurality of channel openings 34 may include more than two channel openings and may be arranged in any manner, such as, for example, equally spaced around the perimeter of the lid 25 .

The air passage 18 further includes a third portion 18c extending along a third direction D3 different from the second direction D2. With the air passage 18 configured to include a third portion 18c, the second portion 18b is disposed between the first portion 18a and the third portion 18c. In this particular embodiment, the air passage 18 includes a plurality of second portions 18b. In other words, the second portion 18b of the air channel 18 is one of the plurality of second portions 18b. The air passage 18 further includes a fourth portion 18d that communicates with each of the plurality of second portions 18b. In this particular embodiment, the air channel 18 includes a plurality of third portions 18c. In other words, the third portion 18c of the air channel 18 is one of the plurality of third portions 18c. The fourth portion 18d communicates with each of the plurality of third portions 18c. As shown in Figure 6, the first, second and third portions 18a, 18b, 18c are all disposed within the cover 25, and the fourth portion 18d is bounded by the circumferential groove of the cover 25 and the inner surface 22a of the oil groove 22. In this embodiment, the first direction D1 and the third direction D3 are parallel to each other. Therefore, the second direction D2 is perpendicular to the third direction D3.

Please refer to FIG. 8 , the oil groove 22 is elongated, so the width W of the groove opening 24 is smaller than the maximum depth D of the oil groove 22 . As such, the restricted size of the sump opening 24 reduces exposure to the environment and potential contamination of elements in the environment by the fluid in the sump. Furthermore, this configuration further enables the hydraulic grooves 12 to be arranged along the hydraulic control device 10 so that the hydraulic grooves 12 and hydraulic control device 10 can achieve a streamlined profile on the bicycle 1 . Please refer to FIG. 8 again, the oil groove 22 has a circular or polygonal cross-section.

Second specific embodiment

The hydraulic control device 210 according to the second embodiment will be described below with reference to FIG. 9. The hydraulic control device 210 has the same configuration as that of the first embodiment except for the configuration of the passage opening 234 . As such, the same numbered elements will have substantially the same functions as those in the first embodiment, and for the sake of simplicity, detailed description and/or illustration will not be repeated.

As shown in FIG. 9 , the hydraulic control device 210 presses the fastener 26 into the cover 25 and establishes a passage opening 234 between the cover 225 and the inner surface 22 a of the oil sump 22 . Like the first embodiment, the first direction D1 and the third direction D3 in this embodiment are parallel to each other. Therefore, the second direction D2 is perpendicular to the third direction D3.

Third specific embodiment

The hydraulic control device 310 according to the third embodiment will be described below with reference to FIG. 10. The hydraulic control device 310 has the same configuration as that of the first embodiment except for the configuration of the passage opening 334 . As such, the same numbered elements will have substantially the same functions as those in the first embodiment, and for the sake of simplicity, detailed description and/or illustration will not be repeated.

As shown in Figure 10, the hydraulic control device 310 is used to form a passage opening 334 through the oil sump 322 . In this particular embodiment, the second portion 318b of the air channel 318 indicated by the dashed line is provided on the cover 325 and is in direct contact with the outside world through the channel opening 334 . Additionally (alternatively), the air passage 318 may include a plurality of second portions 318b, and a fourth portion 318d communicating with each of the plurality of second portions 318b.

Fourth specific embodiment

The hydraulic control device 410 according to the fourth embodiment will be described below with reference to FIG. 11. The hydraulic control device 410 has the same configuration as that of the first embodiment except for the configuration of the passage opening 434 . As such, the same numbered elements will have substantially the same functions as those in the first embodiment, and for the sake of simplicity, detailed description and/or illustration will not be repeated.

As shown in FIG. 11 , the hydraulic control device 410 is provided at least partially within the cover 425 with the passage opening 434 . In this embodiment, the first direction D1 and the third direction D3 are parallel to each other. Therefore, the second direction D2 is perpendicular to the third direction D3.

Fifth specific embodiment

The hydraulic control device 510 according to the fifth embodiment will be described below with reference to the twelfth FIG. 12. The hydraulic control device 510 has the same configuration as that of the first embodiment except for the configuration of the passage opening 534 . As such, the same numbered elements will have substantially the same functions as those in the first embodiment, and for the sake of simplicity, detailed description and/or illustration will not be repeated.

As shown in FIG. 12 , the hydraulic control device 510 includes a hydraulic tank 512 . The hydraulic sump 512 includes a fastener 526 for securing the cover 525 to the oil sump 22 and a passage opening 534 is provided in the fastener 526 . In this specific embodiment, the first direction D1 and the third direction D3 are perpendicular to each other. Providing the channel opening 534 within the already existing fastener 526 eliminates the need to configure a replacement channel opening, thereby reducing the likelihood of dirt or debris entering the hydraulic sump 512 through the additional opening.

Although only selected specific embodiments have been chosen to illustrate the invention, those skilled in the art will appreciate that many changes and modifications can be made without departing from the scope of the invention as defined by the scope of the appended claims. For example, the size, shape, location or orientation of the various elements may vary as desired and/or desired. Elements that are directly connected or in contact with each other may have intermediate structures interposed therebetween. The functions of one element can be performed by two elements, and vice versa. The structure and function of one specific embodiment can be adapted to another specific embodiment. It is not necessary for all advantages to be present in a particular embodiment at the same time. Descriptions of the invention otherwise presented by the applicant should also consider each feature independent of the prior art, alone or in combination with other features, including the structural and/or functional concepts embodied by such feature. As such, the foregoing description of specific embodiments in accordance with the present invention It is for illustration only and not for limitation of the present invention, which is defined by the appended claims and its appendices.

18: Air channel

18a: Part 1

18b: Part II

18c: Part III

18d: Part IV

22: Oil tank

22a: inner surface

22b: outer surface

24: Slot opening

25: Lid

28: Separator

30: Fluid Chamber

32: Air Chamber

34: Channel opening

D1: first direction

D2: Second direction

D3: third direction

Claims (18)

A hydraulic control device (10) for a small vehicle including a bicycle, the hydraulic control device comprising: a hydraulic tank (12) having an air passage (18), wherein the air passage (18) includes a first portion (18a) ) and a second portion (18b), the first portion (18a) extending along a first direction (D1), and the second portion (18b) along a second different from the first direction (D1) direction (D2) extends. The hydraulic control device (10) of claim 1, wherein the hydraulic tank (12) comprises: an oil tank (22) having a tank opening (24); a cover (25) attached to the tank opening (24); and a bulkhead (28) located within the oil sump (22), wherein the hydraulic sump (12) defines a fluid chamber (30) between the oil sump (22) and the bulkhead (28) , and an air chamber (32) between the partition (28) and the cover (25). The hydraulic control device (10) according to claim 2, wherein the air passage (18) is used to make the air chamber (32) communicate with the outside world. The hydraulic control device (10) of claim 3, wherein the air passage (18) further comprises a passage opening (34) facing the outside. The hydraulic control device (10) of claim 4, wherein the air passage (18) comprises a plurality of passage openings (34). The hydraulic control device (10) of claim 4 or 5, wherein the passage opening (34) is defined between the oil sump (22) and the cover (25). The hydraulic control device (10) of claim 4 or 5, wherein the hydraulic sump (12) further includes a fastener (26) for securing the cover (25) to the oil sump (22) , and the passage opening (34) is provided in the fastener (26). The hydraulic control device (10) of claim 2, wherein the oil groove (22) is elongated, so that the width W of the groove opening (24) is smaller than the maximum depth (D) of the oil groove (22). The hydraulic control device (10) of claim 2, wherein the oil groove (22) has a circular or polygonal cross-section. The hydraulic control device (10) of claim 2, wherein the air passage (18) is at least partially disposed in the cover (25). The hydraulic control device (10) of claim 1, wherein the first direction (D1) is perpendicular to the second direction (D2). The hydraulic control device (10) of claim 1, wherein the air passage (18) further comprises a third portion (18) extending along a third direction (D3) different from the second direction (D2) 18c). The hydraulic control device (10) of claim 12, wherein the second part (18b) is disposed between the first part (18a) and the third part (18c). The hydraulic control device (10) of claim 12, wherein the first direction (D1) is perpendicular to the third direction (D3). The hydraulic control device (10) of claim 12, wherein the first direction (D1) is parallel to the third direction (D3). The hydraulic control device (10) of claim 12, wherein the second direction (D2) is perpendicular to the third direction (D3). The hydraulic control device (10) of claim 1, wherein the air passage (18) comprises a plurality of second parts (18b), and the air passage (18) further comprises a fourth part (18d), which Each of the plurality of second portions (18b) is connected. The hydraulic control device (10) of claim 12, wherein the air passage (18) comprises a plurality of third parts (18c); and the air passage (18) further comprises a fourth part (18d), which Each of the plurality of third parts (18c) is connected.

Images